Chimpanzees in West Africa have been spotted banging and throwing rocks against trees and throwing them into gaps inside, leading to piles of rocks. Those rocks do not appear to be for any functional purpose — and might be an example of an early version of ritual behaviour.The discovery might help researchers learn more about the basis of human religion and rituals, and how such activities formed in our own history.The scientist described seeing the behaviour through cameras that were set up to watch the chimpanzees. They saw them assembling piles of stones — of a similar kind of the ritual cairns that have been found throughout human history.

@Taraak Cynos in ussr, children throw snowballs at each other, but to win on this battlefield, you must first train to hit; the first "enemy" in which small urbanized homo notyetsapiens children throw snowballs is homes; the first current "enemy" of a young domesticated primate is the house there